192004765 - E6021 COMPRESSOR ENGAGEMENT - DESCRIPTION

Description

The centre button in the climate control control panel in the centre of the dashboard switches on the air cooling and dehumidifying circuit, activating the air conditioning compressor.

the above button enables the operation of the air cooling circuit; but the actual switching on of the compressor also depends on the intervention of:

  • the frost thermostat sensor, near the evaporator, which stops the air conditioning being switched on if the temperature of the evaporator is too low;
  • the fan linear sensor, located in the refrigerant circuit, which stops the air conditioning being switched on if the pressure of the fluid is too low or too high;
  • the engine control unit which, according to the engine management logic, excludes the operation of the compressor, for example in the case of high engine temperatures or in the case of high engine loads (sharp acceleration).

Description

The appropriate button in the climate control control panel enables operation of the air cooling circuit; when the button is pressed the LED comes on.The above button enables the operation of the air cooling circuit; the actual switching on of the compressor, however, also depends on the climate control system ECU operating strategy.The compressor can also be switched off by the intervention of the thermostatic frost sensor, the fan linear sensor or by the engine management control unit .

Description

For more details    See descriptions 5040 AIR CONDITIONING CASING AND COMPONENTSWith the compressor switched on, the fan is operated at the first speed by means of a special relay located inside the unit.The compressor supply circuit is controlled by a specific relay and protected by a special fuse located in the engine compartment in the junction unit.The fan is supplied by a line protected by a specific fuse and operated by a special relay, in the engine compartment junction unit.The supply for the controls comes via a line controlled by the ignition and protected by a fuse in the underdashboard control unit.